i just got some good news auburn gear is in development of a selectable locker (ected) that will be out mid 05 for the 9.75, good for us, it will be a LS normal driving but with the flip of a swich it goes fully locked, the real cool thing it can be locked on the fly at any speed, for more info www.auburngear.com
as soon as it comes out i am putting one in for anyone who is enterested i will keep you posted, fyi they already make one for the 8.8 ifs in our trucks